5443 Comparison Shopping Search

I am looking for a shopping search engine similar to Froogle or Kelkoo.
Merchants should be able to come to the site and complete a signup form and create an account. They will use their e-mail address for the login name and will be asked to create a password to go with it. They will be asked for a name address etc which will be saved to the database. Once they have signed up, they can log into the Merchant section of the site to add products to the search. This can be achieved in 2 ways. 1 – by adding each product individually by using a form. 2 – by uploading a tab delimited file containing more than 1 product and as many as 1000 products at a time. They will also be able to browse through products as well. Merchants can only see and edit there own products, which are assigned to their page. (admin panel here: [url removed, login to view])
These products will be viewable on the main search engine by shoppers. They can view products by searching, or by browsing through categories (similar to [url removed, login to view])
Ideally category URLS would preferably be displayed as: [url removed, login to view]
There would also need to be an admin panel for me to manually add merchants and be able to delete them or put them on hold as well as add categories.